Go to: http://hanxin0311.iteye.com/blog/1745792
Private map<string, string> strmap = new hashmap<string, string> ();
Private map<string, person> permap = new hashmap<string, person> ();
Private map<string, string[]> strarrymap = new hashmap<string, string[]> ();
Private map<string, list<person>> perlstmap = new hashmap<string, list<person>> ();
Import java.util.ArrayList;
Import Java.util.HashMap;
Import java.util.List;
Import Java.util.Map;
Import Com.expre.struts2.bean.Person;
Import Com.expre.struts2.bean.Phone;
Import Com.opensymphony.xwork2.ActionSupport;
public class Expressmapaction extends Actionsupport {
Private static final long serialversionuid = -4251480679223607716l;
Private map<string, string> strmap = new hashmap<string, string> ();
Private map<string, person> permap = new hashmap<string, person> ();
Private map<string, string[]> strarrymap = new hashmap<string, string[]> ();
Private map<string, list<person>> perlstmap = new hashmap<string, list<person>> ();
Get&set method, which is omitted here.
@Override
Public String Execute () throws Exception {
Value is a string
Strmap.put ("First", "zxx");
Strmap.put ("Second", "LSX");
Strmap.put ("Third", "WxH");
Value is JavaBean object
person person = new Person ("001", "Zxx", 22);
Person.setphone (New Phone ("Apple", 18957157189L));
Permap.put ("one", person);
person = new Person ("002", "LSX", 25);
Person.setphone (New Phone ("HTC", 18957157187L));
Permap.put ("both", person);
Array processing
Strarrymap.put ("arr1", new string[] {"1", "310000", "Hz"});
Strarrymap.put ("arr2", new string[] {"2", "310001", "XH"});
Strarrymap.put ("Arr3", new string[] {"3", "310002", "SC"});
List Object Processing
List<person> list=new arraylist<person> ();
List.add (New Person ("001", "Zxx", 22));
List.add (New Person ("002", "LSX", 25));
Perlstmap.put ("One", list);
List=new arraylist<person> ();
List.add (New Person ("003", "WLX", 26));
List.add (New person ("004", "HZX", 28));
Perlstmap.put ("Both", list);
return "result";
}
}
<body>
<ul>
<li> visit Map:<s:property value= "Strmap"/></li>
<li> accessing an element in map:
<s:property value= "Strmap.first"/> |
<s:property value= "strmap[' second ']"/> |
<s:property value= "strmap[\ ' third\ ']"/>
</li>
<li> Access all Key:<s:property value= "Strmap.keys"/></li> in the map
<li> Access all Value:<s:property value= "Strmap.values"/></li> in the map
<li> access the size of the container:
<s:property value= "strmap.size ()"/> |
<s:property value= "Strmap.size"/>//This is a special place for maps.
</li>
<li> iterative loop values, the simplest
<s:iterator value= "Strmap" id= "entry" >
<s:property value= "#entry"/>{
Key: <s:property value= "key"/>
Value:<s:property value= "Value"/>}|
</s:iterator>
</li>
<li> Iteration Loop values
<s:iterator value= "Strmap.keyset ()" id= "key" >
<s:property value= "key"/> or <s:property value= "#key"/>:
<s:if test= "strmap[#key]!=null" >
<s:property value= "Strmap.get (#key)"/> |
</s:if>
</s:iterator>
</li>
<li> iterating through array values
<s:iterator value= "Strmap" id= "entry" >
<s:property value= "#entry"/>{
<s:property value= "value[0]"/>
<s:property value= "value[1]"/> |
<s:property value= "value[2]"/>}
</s:iterator>
</li>
<li> iterate through the object values, most directly:
<ul>
<s:iterator value= "Permap" id= "entry" >
<li>
<s:property value= "#entry"/> {
Id:<s:property value= "Value.id"/>
Name:<s:property value= "Value.name"/>
Age:<s:property value= "Value.age"/>}|
</li>
</s:iterator>
</ul>
</li>
<li> iterating through the object's property values
<s:iterator value= "Permap.keyset ()" id= "key" >
<s:property value= "#key"/>:
<s:iterator value= "Permap.get (#key)" >
<s:property value= "ID"/>
<s:property value= "Name"/>
<s:property value= "Phone.name"/>
</s:iterator>|
</s:iterator>
</li>
<li> slightly more complex iterations
<s:iterator value= "Perlstmap" id= "entry" >
<s:set name= "Total" value= "#entry. Value.size"/>
<s:iterator value= "#entry. Value" status= "S" >
<s:if test= "#s. First" >
<s:property value= "#entry. Key"/>: Total ${total} bar
</s:if> {
<s:property value= "ID"/> |
<s:property value= "Name"/> |
<s:property value= "Age"/>
};
</s:iterator>
</s:iterator>
</li>
</ul>
</body>
Struts tag traverse map[to]
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